public class _2 {
    public static void main(String[] args ){
        byte a =1;
        int b =a;
        float c =b;
        double d =c;
        System.out.println("byte:"+a);
        System.out.println("int:"+b);
        System.out.println("float:"+c);
        System.out.println("double:"+d);

    }
}
